package com.belazy.library.util.compute;

/**
 * @Description <p> 中文转ASCII码</p>
 * @Author chupeng.tang
 * @CreateTime 2023/5/19 17:29
 * @Version 1.0
 */
public class UnicodeUtils {
    /**
     * <p>中文转ASCII码</p>
     * @auhor chupeng.tang
     * @datetime 2023/5/20 11:50
     * @param: code
     * @return {@link String}
     **/
    public static String native2ascii(String code) {
        char[] chars = code.toCharArray ();
        int charValue = 0;
        String result = "";
        for (int i = 0; i < chars.length; i++) {
            charValue = (int) code.charAt (i);
            if (charValue <= 256) {
                // result += "& "+Integer.toHexString(charValue)+";";
                result += "\\" + Integer.toHexString (charValue);
            } else {
                // result += "&#x"+Integer.toHexString(charValue)+";";
                result += "\\u" + Integer.toHexString (charValue);
            }
        }
        return result;
    }
    /**
     * <p>ASCII码转中文</p>
     * @auhor chupeng.tang
     * @datetime 2023/5/20 11:50
     * @param: code
     * @return {@link String}
     **/
    public static String ascii2native(String code) {
        char aChar;
        int len = code.length ();
        StringBuffer outBuffer = new StringBuffer (len);
        for (int x = 0; x < len; ) {
            aChar = code.charAt (x++);
            if (aChar == '\\') {
                aChar = code.charAt (x++);
                if (aChar == 'u') {
                    // Read the xxxx
                    int value = 0;
                    int length = 4;
                    for (int i = 0; i < length; i++) {
                        aChar = code.charAt (x++);
                        switch (aChar) {
                            case '0':
                            case '1':
                            case '2':
                            case '3':
                            case '4':
                            case '5':
                            case '6':
                            case '7':
                            case '8':
                            case '9':
                                value = (value << 4) + aChar - '0';
                                break;
                            case 'a':
                            case 'b':
                            case 'c':
                            case 'd':
                            case 'e':
                            case 'f':
                                value = (value << 4) + 10 + aChar - 'a';
                                break;
                            case 'A':
                            case 'B':
                            case 'C':
                            case 'D':
                            case 'E':
                            case 'F':
                                value = (value << 4) + 10 + aChar - 'A';
                                break;
                            default:
                                throw new IllegalArgumentException (
                                        "Malformed   \\uxxxx   encoding.");
                        }
                    }
                    outBuffer.append ((char) value);
                } else {
                    if (aChar == 't') {
                        aChar = '\t';
                    } else if (aChar == 'r') {
                        aChar = '\r';
                    } else if (aChar == 'n') {
                        aChar = '\n';
                    } else if (aChar == 'f') {
                        aChar = '\f';
                    }
                    outBuffer.append (aChar);
                }
            } else {
                outBuffer.append (aChar);
            }

        }
        return outBuffer.toString ();
    }
}
